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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd104767f95ddad5a0661aeec6223192dc1c972dfd77409031783672e05b41aa1' 
  AND token = 'Z6Pn6Oj4WdpiyE4pr3dPIYfGJpirngCwpdz1z6P2Upw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}